Key-socket for electric incandescent lamps.



G. W. GOODRIDGE. KEY sooKET PQR BLEGTRIQ INGANDESGBNT LAMPS.

Patented Sept. 6,1910.

APPLIOATIOH FILED 00T. 2, 1903.

INVENTOR p ATTORNEYS UNTTED sTATEs PATENT oEEioE.

GILBERT W. GOODRIDGE, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THEBRYANT ELECTRIC COMPANY, OF BRIDGEPOBT, CONNECTICUT, A CORPORATION OF CON- NECTICUT.

IKEY-SOCKET FOB ELECTRIC INCANDESCENT LAMPS.

Specification of Letters Patent.

Patented Sept. 6, 1910.

Application' filed October 2, 1908. Serial No. 455,891.

To all whom it 'may concern.'

B e it known that I, GILBERT 1V. Goon- RIDGE, a citizen of the United States of America, residing in the cityof Bridgeport, lin the county of Fairfield, in 'the State of Connecticut, have invented a certain new and useful Improved Key-Socket for Electric Incandescent Lamps, of which the following is a specification.

The main object of my invention is to so construct a key socket t'or electric inca'n'i descent lamps that it will occupy 'the smallest possible space While suliplying the requirements ot' standard sizes otl lamps and have a switch giving a breaking distance sufficient for acnrrent of 250 volts as required by 'the underwriters rules. My improved construction makes a 'socket especially well adapted for tixture work in which the sockets have mental husks. i

In the accompanying drawings Figure 1 is a longitudinal section through my improved ke v socket. the outer metallic shell and the insulatinglr lining therein being indicated by dotted lines: view on the line 2 2, Fig. l. the shell and its lining being omitted; Fig. 3 is a scctional View on the line 3 3. Fig. 4; Fig. 4 is a face view of 'the device with the screw shell removed; Fig. is a perspective view of the insulation in and on which the key mechanism, terminals and contacts are mounted. A

The insulating body A, upon which the key mechanism, contacts and terminals are mounted may be made of porcelain or other suitable material and its shape .is illustrated in Fig. 5, it being there shown without any of the metal parts. This insulating body A has a deep cen'tral well or chamber 5 to receive the switch mechanism, with a side slot 6 for the passage of the spindle v7 of the switch key, this slot being enlarged on its outer side as shown at S in Fig., 5 to'receive and guide 'the cylindrical part of the key button 9. The mouth of the well of the insulating body is referably tia red as at 10, leaving an annu ar surface 1l on which is mounted the flanged lower end of the lampreceiving screw shell S. The latter is secured bv screws 12,'and 13, Figs. 3 and 4;, passing t rough the insulating body from the rear, and one of these screws 12 serves to he inclosed within orna Fig. 2 is a sectional y at the same. time to secure in a recess 15 at the rear of the insulating body the terminal plate 14 with binding post 16 for one of the contact wines. The annular surface 11 at Vthe mouth of the well is notched out or grooved at 17, and diametrically opposite this notch 17 the annular surface is similarly grooved a't 18 (in the case illustrated, over the slot 6 for the key spindle). In these grooves 17 and 18 is supported a contactplate lt) iirmly secured to the bottbm ot' the groove central part of this cross plate 19 may be en larged in width to close' up the mouth of the well, as shown in Fig. 1, and it has secured to it a button 21 vagainst which the central terminal of the4 lamp base may contact. but as shown in the drawing, this contact is back of the screw shell S some lit'tle distance and when the lamp is screwed in to the shell S the central contact ot' the lamp base will project'well in'to the mouth of the well. By this means 1 am enabled to make a socket three-eighths of an inch shorter than the ordinary standard socket.

So far as concerns my switch mechanism, I do not restrict myself, but I prefer to use a construction similar to that shown in the Perkins Patent No. 626,927, June 13, 189%), because that switch gives a large break. This comprises an oblong switch block 40, mounted with play, as usual, upon the spindle 7 of the key and cooperating with a contact plate 24, (Fig. 2), secured in the bottom of the well 5 of the insulating body and provided with a binding post 29 at the open side of the insulating body through 'which the plate 24 projects, (Fig. 2). This switch block l0 is confined between plates 32 carried by the contact plate 19 and is acted on by a spiral spring 37 between the cross plate.' 19 and a disk 36 guided to slide on the plate 32, as in the Perkins construction.

I claim as my invention;-

1. An 'electric lamp key socket, with a chambered insulating body, a switch mechanism therein, a screw shell mounted on the insulating body to' form a lamp-receiving terminal and a central contact plate back of the screw shell in combination with cooperating switch mechanism, carried by the contact plate.

2. An electric lamp key socket, having an insulating body with a well to receive the 17 by a bolt and nu't 20. The

switch mechanism, a screw shell forming one of the lamp terminals, mounted onthe insulating body, at the mouth of the well, and a central contact plate projecting across the mouth of the well back of the said screw shell in combination with coperating switch mechanism, carried by the contact plate.

3. Anelectrie lamp key socket, having' a chambered insulating body with a well for the switch mechanism, an annular shoulder at the mouth of the well to receive the screw shell terminal, notches 1n said annular shoulder, and a Contact plate mounted in said notches and back of the screw shell in combination with cooperating switch mech- 15A anism.

In testimony -whereof I have signed my name to this speciiication, in the presence of two subscribing witnesses.

GILBERT W. GOODRIDGE.

Witnesses:

F. E. SEELEY, H. W. GoLDsBoRoUGH. 

